santosh-asp tutorial

Handling events in AngularJS:-

Let us understand with an example. Here is what we want to do.

Display the list of technologies in a table
Provide the ability to like and dislike a technology
Increment the likes and dislikes when the respective buttons are clicked

Script.js:- In the controller function we have 2 methods to increment likes and dislikes. Both the functions have the technology object that we want to like or dislike as a parameter.

  

var app = angular
            .module("myModule", [])
            .controller("myController", function ($scope) {

                var technologies = [
                    { name: "C#", likes: 0, dislikes: 0 },
                    { name: "ASP.NET", likes: 0, dislikes: 0 },
                    { name: "SQL", likes: 0, dislikes: 0 },
                    { name: "AngularJS", likes: 0, dislikes: 0 },
                    { name: "MVC", likes: 0, dislikes: 0 }
                ];

                $scope.technologies = technologies;

                $scope.incrementLikes = function (technology) {
                    technology.likes++;
                };

                $scope.incrementDislikes = function (technology) {
                    technology.dislikes++;
                };
            });

Demo.html : Notice in the html below, we are associating incrementLikes() and incrementDislikes() functions with the respective button. When any of these buttons are clicked, the corresponsing technology object is automatically passed to the function, and the likes or dislikes property is incremented depending on which button is clicked.

  

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script src="angular.min.js"></script>
    <script src="Script.js"></script>   


        <style type="text/css">

      table {
    border-collapse: collapse;
    font-family:Arial;
}

td {
    border: 1px solid black;
    padding: 5px;
}

th {
    border: 1px solid black;
    padding: 5px;
    text-align: left;
}


</style>
</head>
<body ng-app="myModule">
    <div ng-controller="myController">
        <table>
            <thead>
                <tr>
                    <th>Name</th>
                    <th>Likes</th>
                    <th>Dislikes</th>
                    <th>Like/Dislike</th>
                </tr>
            </thead>
            <tbody>
                <tr ng-repeat="technology in technologies">
                    <td> {{ technology.name }} </td>
                    <td style="text-align:center"> {{ technology.likes }} </td>
                    <td style="text-align:center"> {{ technology.dislikes }} </td>
                    <td>
                        <input type="button" ng-click="incrementLikes(technology)" value="Like" />
                        <input type="button" ng-click="incrementDislikes(technology)" value="Dislike" />
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
</body>
</html>

Out Put: Run the application and get out put:-